Natural gas is located in porous ro

Natural gas is located in porous rocks called the reservoir. Reservoir rocks are often sandstone and can be located between 2 and 5miles below ground. Reservoir rocks can be located under land or the ocean floor. Since the density of natural gas is relatively low,when it forms it rises to the surface and spreads into the air. Some underground natural gas will rise up through geological formations made of porous rocks. The porous sediment is surrounded by impermeable rock that can trap natural gas underground and prevent the flow of gas to the surface. Thus, one of the most important factors keeping gas underground and not spreading to the air is the presence of impermeable layers called traps. A large trap can trap and cause an accumulation of a vast amount of natural gas under the ground or sea floor.